The pupils here_____ all kinds of exercises every day in the past few weeks. 
#104326
A
keptbusydoing
B
keepondoing
C
havekeptbusydoing
D
havebeenkeptbusydoing
推荐题目
 The pen      well, so it ___ well. 
#101517
A
is written, is sold
B
is writing, is selling
C
is written, sells
D
writes, sells
During his stay in Xi’an, Jerry tried almost all the local foods his friends ________,
#99073
A
would recommend
B
had recommended
C
have recommended
D
were recommending